1. Snap vanilla pods, and remove seeds.
2. Place in a bowl, with the egg yolks.
3. Blend or mix powdered almonds and icingsugar together.
4. Add flour and salt, mix again.
5. Add butter and blend for a further ten seconds, or mix thoroughly.
6. Add egg yolks and vanilla seeds, mix until you have a smooth paste.
7. Roll into a ball, and chill for at least an hour in the fridge.